BiOCl nanosheets/TiO₂ nanotube arrays heterojunction UV photodetector (PD) with high performance is fabricated by a facile anodization process and an impregnation method. The heterojunction at the interface and the internal electric fields in the BiOCl nanosheets faciliate the separation of photogenerated charge carriers and regulate the transportation of the electrons. Compared with the large dark current (≈10⁻⁵ A), low on/off ratio (8.5), and slow decay time (>60 s) of the TiO₂ PD, the optimized heterojunction PD (6‐BiOCl–TiO₂) yields dramatically decreased dark current (≈1 nA), ultrahigh on/off ratio (up to 2.2 × 10⁵), and fast decay speed (0.81 s) under 350 nm light illumination at −5 V. Moreover, it exhibits an increased responsivity of 41.94 A W⁻¹, a remarkable detectivity (D*) of 1.41 × 10¹⁴ Jones, and a high linear dynamic range of 103.59 dB. The loading amount and growth orientations of the BiOCl nanosheets alter the roles of the self‐induced internal electric field in regulating the behaviors of the charge carriers, thus affecting the photoelectric properties of the heterojunction PDs. These results demonstrate that rational construction of novel heterojunctions hold great potentials for fabricating photodetectors with high performance.

中文翻译：

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高性能BiOCl纳米片/ TiO2纳米管阵列异质结紫外光电探测器：BiOCl纳米片中自感应内部电场的影响

通过简便的阳极氧化工艺和浸渍方法，制备出高性能的BiOCl纳米片/ TiO ₂纳米管阵列异质结紫外光电探测器（PD）。BiOCl纳米片中界面处的异质结和内部电场有助于光生载流子的分离并调节电子的传输。与大的暗电流（≈10相比^-5在TiO的A），低开/关比（8.5），和缓慢的衰减时间（> 60秒）₂ PD，优化异质结PD（6-的BiOCl-TIO ₂）产生显着降低的暗电流（≈1nA），超高的开/关比（高达2.2×10 ⁵）以及在-5 V下在350 nm光照射下的快速衰减速度（0.81 s）。此外，它显示出41.94 AW ^-1的增加的响应度，1.41×10 ¹⁴ Jones的显着检测率（D *）和高的线性动态范围为103.59 dB。BiOCl纳米片的负载量和生长方向改变了自感应内部电场在调节电荷载流子行为方面的作用，从而影响了异质结PD的光电性能。这些结果表明，合理构造新型异质结具有制造高性能光电探测器的巨大潜力。